I think he meant terminal, not kernel
(dont know if this was moved since, but it is in the fedora forum)
Anyway it's odd that only root can use it, i would use yum to get xmms-mp3 or whatever it's called (
then use yum to install
yum install <package>
if not then check the permissions in the xmms folder with
may turn up something useful (maybe theres files in the root ~/.xmms that aren't in your users.
you can create a launcher by making a desktop icon or tasbar applet and putting that command in the right field, or make an alias for xmms to be that command, or a shell script, there are quite a few ways